package com.leon.document_auto_generation_tool.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author XZG
 * @creatTime 2023-03-17
 * <p>
 * 【配置类】配置一个 ThreadPoolTaskExecutor 异步线程池，@EnableAsync 注解开启异步多线程
 */
@Configuration
@EnableAsync
public class ExecutorConfig {

    @Value("${spring.task.execution.pool.core-size}")
    private int corePoolSize = Runtime.getRuntime().availableProcessors() - 1;
    @Value("${spring.task.execution.pool.max-size}")
    private int maxPoolSize;
    @Value("${spring.task.execution.pool.queue-capacity}")
    private int queueCapacity;
    @Value("${spring.task.execution.pool.keep-alive}")
    private int keepAliveSeconds;
    @Value("${spring.task.execution.thread-name-prefix}")
    private String namePrefix;

    @Bean
    public Executor asyncServiceExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 配置核心线程数
        executor.setCorePoolSize(corePoolSize);
        // 配置最大线程数
        executor.setMaxPoolSize(maxPoolSize);
        // 配置队列大小
        executor.setQueueCapacity(queueCapacity);
        // 配置线程存活时间
        executor.setKeepAliveSeconds(keepAliveSeconds);
        // 配置线程池中的线程的名称前缀
        executor.setThreadNamePrefix(namePrefix);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 执行初始化
        executor.initialize();
        return executor;
    }

}
